The B1 is the ultimate solution when you need to work without having electrictity on set. It is small, lightweight and fits nearly all Profoto lightformers. The Battery lasts about 250 full power 500Ws flashes. It comes with the convienient flat front glass. For some reflectors can you can also use the dome style frontglass to get more acurate results.It features TTL and HSS with the build in Air module. Be sure to have the TTL Remote fitting your camerasystem rented with this item.